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Message: <blockquote data-quote="Mike D90" data-source="post: 217188" data-attributes="member: 17556">On these last shots I posted I did not set minimum shutter speed while in A-priority.  Some of the others previously I had set min shutter at 1/320th sec.  That drove the ISO into the 1600 range.I do understand now. Stopping down is actually making the aperture smaller even on a lens that can achieve maximum aperture of  f/4 at any zoom length.  Correct?So stopping down gives more DOF and a sharper image over all?But, that too drives ISO into the higher numbers just like a faster shutter speed does. Higher ISO seems to be bad for my images?  Am I still missing something?</blockquote>